behind

1 at or towards the back of somebody/something; further backShe rode off down the road with the dog running behind.The others are a long way behind.He was shot from behind as he ran away.I had fallen so far behind that it seemed pointless trying to catch up.

2 in the place where somebody/something is or wasI was told to stay behind after school (= remain in school).This bag was left behind after the class.

3 late in paying money or completing workbehind (with something)She's fallen behind with the payments.behind (in something)He was terribly behind in his work.